The microstructure evolution of 316L stainless steels subjected to torsion deformation and its corrosion resistance in 1 M H₂SO₄ solutions were studied. Microstructure evolution of the annealed and torsion-processed samples was characterized by x-ray diffraction and electron backscatter diffraction techniques. The results showed that no martensitic transformation occurred during torsion deformation, while dynamic recrystallization occurred within the samples slowing down the tendency of increasing dislocation density and storage energy. Electrochemical tests including potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were used in the 1 M H₂SO₄ solution to evaluate the corrosion resistance of the annealed and torsion-processed samples. The results illustrated that small deformation (torsion for 1 turn) could enhance the corrosion resistance of the 316L stainless steels by increasing the stability of the passive film, the medium deformation (torsion for 3 turns) will deteriorate the corrosion resistance due to high-density dislocations formed during torsion deformation, while large deformation (torsion for 5 turns) could improve the corrosion resistance compared with the medium deformation due to the occurrence of dynamic recrystallization and the high-density deformation twins formed.

研究了扭转变形316L不锈钢组织演变及其在1 MH ₂ SO ₄溶液中的耐蚀性。退火和扭转加工样品的微观结构演变通过 X 射线衍射和电子背散射衍射技术进行表征。结果表明，在扭转变形过程中没有发生马氏体相变，而样品内部发生动态再结晶，减缓了位错密度和存储能量增加的趋势。电化学测试包括动电位极化测试和电化学阻抗谱 (EIS) 用于 1 MH ₂ SO ₄评估退火和扭转加工样品的耐腐蚀性的解决方案。结果表明，小变形（扭转 1 圈）可以通过增加钝化膜的稳定性来提高 316L 不锈钢的耐腐蚀性，中等变形（扭转 3 圈）会因高密度而降低耐腐蚀性。扭转变形过程中形成位错，而大变形（扭转5圈）由于发生动态再结晶和形成高密度变形孪晶，与中等变形相比可以提高耐腐蚀性。